sound/soc/codecs/max98357a.c

   1 /* Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 and
   5  * only version 2 as published by the Free Software Foundation.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * max98357a.c -- MAX98357A ALSA SoC Codec driver
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/gpio.h>
  17 #include <sound/soc.h>
  18
  19 #define DRV_NAME "max98357a"
  20
  21 static int max98357a_daiops_trigger(struct snd_pcm_substream *substream,
  22                 int cmd, struct snd_soc_dai *dai)
  23 {
  24         struct gpio_desc *sdmode = snd_soc_dai_get_drvdata(dai);
  25
  26         switch (cmd) {
  27         case SNDRV_PCM_TRIGGER_START:
  28         case SNDRV_PCM_TRIGGER_RESUME:
  29         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
  30                 gpiod_set_value(sdmode, 1);
  31                 break;
  32         case SNDRV_PCM_TRIGGER_STOP:
  33         case SNDRV_PCM_TRIGGER_SUSPEND:
  34         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
  35                 gpiod_set_value(sdmode, 0);
  36                 break;
  37         }
  38
  39         return 0;
  40 }
  41
  42 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {
  43         SND_SOC_DAPM_DAC("SDMode", NULL, SND_SOC_NOPM, 0, 0),
  44         SND_SOC_DAPM_OUTPUT("Speaker"),
  45 };
  46
  47 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
  48         {"Speaker", NULL, "SDMode"},
  49 };
  50
  51 static int max98357a_codec_probe(struct snd_soc_codec *codec)
  52 {
  53         struct gpio_desc *sdmode;
  54
  55         sdmode = devm_gpiod_get(codec->dev, "sdmode");
  56         if (IS_ERR(sdmode)) {
  57                 dev_err(codec->dev, "%s() unable to get sdmode GPIO: %ld\n",
  58                                 __func__, PTR_ERR(sdmode));
  59                 return PTR_ERR(sdmode);
  60         }
  61         gpiod_direction_output(sdmode, 0);
  62         snd_soc_codec_set_drvdata(codec, sdmode);
  63
  64         return 0;
  65 }
  66
  67 static struct snd_soc_codec_driver max98357a_codec_driver = {
  68         .probe                  = max98357a_codec_probe,
  69         .dapm_widgets           = max98357a_dapm_widgets,
  70         .num_dapm_widgets       = ARRAY_SIZE(max98357a_dapm_widgets),
  71         .dapm_routes            = max98357a_dapm_routes,
  72         .num_dapm_routes        = ARRAY_SIZE(max98357a_dapm_routes),
  73 };
  74
  75 static struct snd_soc_dai_ops max98357a_dai_ops = {
  76         .trigger        = max98357a_daiops_trigger,
  77 };
  78
  79 static struct snd_soc_dai_driver max98357a_dai_driver = {
  80         .name = DRV_NAME,
  81         .playback = {
  82                 .stream_name    = DRV_NAME "-playback",
  83                 .formats        = SNDRV_PCM_FMTBIT_S16 |
  84                                         SNDRV_PCM_FMTBIT_S24 |
  85                                         SNDRV_PCM_FMTBIT_S32,
  86                 .rates          = SNDRV_PCM_RATE_8000 |
  87                                         SNDRV_PCM_RATE_16000 |
  88                                         SNDRV_PCM_RATE_48000 |
  89                                         SNDRV_PCM_RATE_96000,
  90                 .rate_min       = 8000,
  91                 .rate_max       = 96000,
  92                 .channels_min   = 1,
  93                 .channels_max   = 2,
  94         },
  95         .ops    = &max98357a_dai_ops,
  96 };
  97
  98 static int max98357a_platform_probe(struct platform_device *pdev)
  99 {
 100         int ret;
 101
 102         ret = snd_soc_register_codec(&pdev->dev, &max98357a_codec_driver,
 103                         &max98357a_dai_driver, 1);
 104         if (ret)
 105                 dev_err(&pdev->dev, "%s() error registering codec driver: %d\n",
 106                                 __func__, ret);
 107
 108         return ret;
 109 }
 110
 111 static int max98357a_platform_remove(struct platform_device *pdev)
 112 {
 113         snd_soc_unregister_codec(&pdev->dev);
 114
 115         return 0;
 116 }
 117
 118 #ifdef CONFIG_OF
 119 static const struct of_device_id max98357a_device_id[] = {
 120         { .compatible = "maxim," DRV_NAME, },
 121         {}
 122 };
 123 MODULE_DEVICE_TABLE(of, max98357a_device_id);
 124 #endif
 125
 126 static struct platform_driver max98357a_platform_driver = {
 127         .driver = {
 128                 .name = DRV_NAME,
 129                 .of_match_table = of_match_ptr(max98357a_device_id),
 130         },
 131         .probe  = max98357a_platform_probe,
 132         .remove = max98357a_platform_remove,
 133 };
 134 module_platform_driver(max98357a_platform_driver);
 135
 136 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
 137 MODULE_LICENSE("GPL v2");
 138 MODULE_ALIAS("platform:" DRV_NAME);